Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys

Xue, Yufei; Zhong, Hong; Li, Laiping; Fu, Hengzhi

doi:10.1007/s40195-015-0227-7

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…The appearance of HCP_A3 phase is not surprising for Ti 4 V 3 NbCr 2 alloys rich in Ti and V elements, since the accepted binary Ti-V phase diagram [48] shows a large temperature range of HCP_A3 phase formation. Similar phase diagram can be found for Ti 3 V 3 Nb 2 Cr 2 and Ti 2 V 3 Nb 3 Cr 2 alloys with HCP_A3 phase replaced by C15_Laves phase, which is very common in the Ti-Nb-Cr system [49]. It should be noted that although the phase diagram predicts a slight content of second phase (HCP_A3 or C15_Laves) at low temperatures, the wide temperature range suggests a tendency for all alloys to form single-phase structures considering the melting cooling process.…”

Section: Calculation Of Phase Diagrams In Ti-v-nb-cr Systemsupporting

confidence: 75%

Solid-State Hydrogen Storage Properties of Ti–V–Nb–Cr High-Entropy Alloys and the Associated Effects of Transitional Metals (M = Mn, Fe, Ni)

Cheng

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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Recently, high-entropy alloys (HEAs) designed by the concepts of unique entropy-stabilized mechanisms, started to attract widespread interests for their hydrogen storage properties. HEAs with body-centered cubic (BCC) structures present a high potential for hydrogen storage due to the high hydrogen-to-metal ratio (up to H/M = 2) and vastness of compositions. Although many studies reported rapid absorption kinetics, the investigation of hydrogen desorption is missing, especially in BCC HEAs. We have investigated the crystal structure, microstructure and hydrogen storage performance of a series of HEAs in the Ti–V–Nb–Cr system. Three types of TiVCrNb HEAs (Ti4V3NbCr2, Ti3V3Nb2Cr2, Ti2V3Nb3Cr2) with close atomic radii and different valence electron concentrations (VECs) were designed with single BCC phase by CALPHAD method. The three alloys with fast hydrogen absorption kinetics reach the H/M ratio up to 2. Particularly, Ti4V3NbCr2 alloy shows the hydrogen storage capacity of 3.7 wt%, higher than other HEAs ever reported. The dehydrogenation activation energy of HEAs’ hydride has been proved to decrease with decreasing VEC, which may be due to the weakening of alloy atom and H atom. Moreover, Ti4V3NbCr2M (M = Mn, Fe, Ni) alloys were also synthesized to destabilize hydrides. The addition of Mn, Fe and Ni lead to precipitation of Laves phase, however, the kinetics did not improve further because of their own excellent hydrogen absorption. With increasing the content of Laves phase, there appear more pathways for hydrogen desorption so that the hydrides are more easily dissociated, which may provide new insights into how to achieve hydrogen desorption in BCC HEAs at room temperature.

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Section: Calculation Of Phase Diagrams In Ti-v-nb-cr Systemsupporting

confidence: 75%

Solid-State Hydrogen Storage Properties of Ti–V–Nb–Cr High-Entropy Alloys and the Associated Effects of Transitional Metals (M = Mn, Fe, Ni)

Cheng

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…However, in the reliability evaluation of equipment, fracture failure has become one of the main problems affecting the reliability of equipment. Therefore, the investigation on fracture toughness has always been a hot and difficult topic in engineering [7][8][9][10]. The fracture toughness parameters including elastic fracture and elastic-plastic fracture according to the plastic deformation ability of the material are mainly appointed to be the stress intensity factor (K) [11,12], the energy release rate (G) [13], J-integral [14] and crack tip open displacement (CTOD) [15], respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal

Fang

Zhao

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The microstructure and fracture toughness of weld metal under Ti-free and Ti-containing different fluxes were investigated in this study. It was found that the trace element Ti of flux in submerged arc welding produced significant influence on the fracture toughness. The addition of 60 ppm Ti induced the sharp increase in J 0.2 value from 232.78 to 364.08 kJ/m 2 . Microstructure characterization revealed that a large number of oxide inclusions prompted the nucleation of acicular ferrites and refined grains, which improved the fracture toughness of Ti-containing weld metal greatly. Moreover, the crack propagation path was more tortuous and bifurcated due to the small amount of carbide precipitations along grain boundaries and blocky martensite-austenite islands for Ti-containing weld metal. Meanwhile, the large-angle grain boundaries caused crack deflection and increased the resistance of crack propagation compared to Ti-free weld metal.

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Formation of non-equilibrium ductile solid solutions and textures in NbCr2 bulks produced by mechanical milling and spark plasma sintering

Gao

2020

Journal of Alloys and Compounds

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Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys

Cited by 8 publications

References 28 publications

Solid-State Hydrogen Storage Properties of Ti–V–Nb–Cr High-Entropy Alloys and the Associated Effects of Transitional Metals (M = Mn, Fe, Ni)

Solid-State Hydrogen Storage Properties of Ti–V–Nb–Cr High-Entropy Alloys and the Associated Effects of Transitional Metals (M = Mn, Fe, Ni)

Effect of Trace Element on Microstructure and Fracture Toughness of Weld Metal

Formation of non-equilibrium ductile solid solutions and textures in NbCr2 bulks produced by mechanical milling and spark plasma sintering

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